问题
单项选择题
2010年6月21日，美元对人民币汇率为1：6．8275；2011年6月21日，美元对人民币汇率为1：6．4690。这一变动说明（）
①汇率是两种货币之间的兑换比率
②美元对人民币的汇率下降
③美元对人民币的汇率升高
④美元贬值，人民币升值
A.①②
B.②③
C.③④
D.②④
答案
参考答案：D
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2010年6月21日，美元对人民币汇率为1：6．8275；2011年6月21日，美元对人民币汇率为1：6．4690。这一变动说明（）
①汇率是两种货币之间的兑换比率
②美元对人民币的汇率下降
③美元对人民币的汇率升高
④美元贬值，人民币升值
A.①②
B.②③
C.③④
D.②④
参考答案：D
Many people go to school for education．They learn languages，history，geography, physics , chemistry and math．Others go to school to learn a skill__1___they can make a living. School education is very important and useful，but no one can learn _2____ from school. A teacher，no matter how much he knows，can’t teach his students everything they want to know. The teacher’s．job is to show his students how to read and 3 to think．So much more is to be learned out of school 4 students themselves. It is always more important to know how to study by oneself than to memorize some 5 or formulas(公式)．It is actually quite 6 to learn a certain fact in history or a formula in mathematics．But it is very difficult to use a formula in working out a math problem. Great scientists such as Einstein，Newton and Galileo，didn’t learn many things from school, but they were all 7 and invented many things for mankind. The 8 for their success is that they knew how to study．They read books that were not 9 at school . They worked hard all their lives 10 not a single minute . They would ask many questions as they read and they did thousands of experiments．
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